Fig. 2. Stratigraphic section of the Wugang BIF (Liu et al., 2018).
Fig. 3. Photos of iron ores from the Wugang BIF.
Fig. 4. Photomicrographs of iron ores from the Wugang BIF.
Fig. 5. PAAS (Post Archean Australian Shale)–normalized REY patterns of iron ores from the Wugang BIF (red solid line). Comparable data are (Liu et al., 2018).The values of the high–temperature hydrothermal fluid (Bau and Dulski, 1999) and seawater (Alibo and Nozaki, 1999) are shown for comparison.
Fig. 6. The (Ce/Ce*)SN vs (Pr/Pr*)SN diagram (Bau and Dulski, 1996).
Fig. 7. Elemental ratio plots with three component (Alexander et al., 2008). Comparable data (Liu et al., 2018) are plotted together. The values of the high–temperature hydrothermal fluid (Bau and Dulski, 1999), seawater (Alibo and Nozaki, 1999) and upper continental crust (Rudnick and Gao, 2003) used three end members.
Fig. 1. (a) Geological map of the North China Craton and location of study area, modified after Zhao et al. (2005). (b) Simplified geological map of the Wugang area (Li et al., 2014).
Table 1. Major elements (wt.%) of the Wugang BIF and average BIFs in NCC
Table 2. Rare earth elements (ppm) compositions and their ratios of the Wugang BIF